USA freeways styled with a unique value renderer displaying freeway types
What is a unique types style? A unique types style assigns distinct symbols to unique data values returned from a field or expression in a layer. You can use this style to visualize what something represents, such as:
Show points of interest on a map (e.g. schools, parks, places of worship) Represent categories of data (e.g. regions, types) Visualize ordinal data (e.g. high, medium, and low) How a unique types style works This style is configured with a Unique Value Renderer . This renderer requires the following:
A reference to a data value either from a field name, or an Arcade expression . A list of unique value infos that match a unique symbol with an expected value returned from the field or expression. Examples Categorical data This example demonstrates how to visualize categories using a string attribute value. The app visualizes freeways based on their classification: interstate, state highway, or U.S. highway.
Create a Unique Value Renderer . Reference the field name containing the classification values. Create unique value info objects and assign a symbol to each expected value. You can optionally add a default symbol to represent all features that don't have a matching value. Expand
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const hwyRenderer = {
type : "unique-value" ,
legendOptions : {
title : "Freeway type"
},
field : "RTTYP" ,
uniqueValueInfos : [{
value : "S" ,
label : "State highway" ,
symbol : {
type : "simple-line" ,
color : "#e6d800" ,
width : "6px" ,
style : "solid"
}
}, {
value : "I" ,
label : "Interstate" ,
symbol : {
type : "simple-line" ,
color : "#e60049" ,
width : "6px" ,
style : "solid"
}
}, {
value : "U" ,
label : "US Highway" ,
symbol : {
type : "simple-line" ,
color : "#9b19f5" ,
width : "6px" ,
style : "solid"
}
}]
};
Points of interest (3D) This example demonstrates how to visualize points of interest (POI) in a 3D scene. This demo shows how to create POI symbols with a PictureMarkerSymbol . You can also use web styles to create the same visualization.
Create a unique value renderer . Reference the field name containing the location type (e.g. museum, park, etc.). Create unique value info objects and assign a symbol to each expected value. Expand
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// Expand the code above to view how each marker
// symbol is created in getUniqueValueSymbol()
const pointsRenderer = {
type : "unique-value" ,
field : "Type" ,
uniqueValueInfos : [
{
value : "Museum" ,
symbol : getUniqueValueSymbol( "https://developers.arcgis.com/javascript/latest/sample-code/visualization-point-styles/live/Museum.png" , "#D13470" )
},
{
value : "Restaurant" ,
symbol : getUniqueValueSymbol( "https://developers.arcgis.com/javascript/latest/sample-code/visualization-point-styles/live/Restaurant.png" , "#F97C5A" )
},
{
value : "Church" ,
symbol : getUniqueValueSymbol( "https://developers.arcgis.com/javascript/latest/sample-code/visualization-point-styles/live/Church.png" , "#884614" )
},
{
value : "Hotel" ,
symbol : getUniqueValueSymbol( "https://developers.arcgis.com/javascript/latest/sample-code/visualization-point-styles/live/Hotel.png" , "#56B2D6" )
},
{
value : "Park" ,
symbol : getUniqueValueSymbol( "https://developers.arcgis.com/javascript/latest/sample-code/visualization-point-styles/live/Park.png" , "#40C2B4" )
}
]
};
Ordinal data This example demonstrates how to create ordinal categories from a numeric field attribute using an Arcade expression. This app classifies highways by low, medium, or high truck traffic.
Create a unique value renderer. Write an Arcade expression to classify the data into ordinal categories: low, medium, and high. Then reference it in the value property. See the snippet below. Create unique value info objects and assign a symbol to each expected value. You can optionally add a default symbol to represent all features that don't have a matching value. Arcade expression classifying the numeric data
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var traffic = $feature .AADT;
When (
traffic > 80000 , "High" ,
traffic > 20000 , "Medium" ,
"Low"
);
Reference the Arcade expression in the valueExpression property
Expand
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const renderer = {
type : "unique-value" ,
valueExpression : `
var traffic = $feature.AADT;
When(
traffic > 80000, "High",
traffic > 20000, "Medium",
"Low"
);
` ,
valueExpressionTitle : "Traffic volume" ,
uniqueValueInfos : [{
value : "High" ,
symbol : {
type : "simple-line" ,
color : "#810f7c" ,
width : "6px" ,
style : "solid"
}
}, {
value : "Medium" ,
symbol : {
type : "simple-line" ,
color : "#8c96c6" ,
width : "3px" ,
style : "solid"
}
}, {
value : "Low" ,
symbol : {
type : "simple-line" ,
color : "#9d978b" ,
width : "1px" ,
style : "solid"
}
}]
};
Categorical data (3D) This example visualizes buildings based on building type: residential, commercial or mixed use. A unique value renderer assigns a color to each building based on the building's usage attribute.
Steps Create different symbols for each building type. Assign the symbols to a unique value renderer. Assign the renderer to the scene layer. Expand
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const typeRenderer = {
type : "unique-value" ,
legendOptions : {
title : "Building Type"
},
defaultSymbol : {
type : "mesh-3d" ,
symbolLayers : [
{
type : "fill" ,
material : { color : "#FFB55A" , colorMixMode : "replace" }
}
]
},
defaultLabel : "Others" ,
field : "landuse" ,
uniqueValueInfos : [
{
value : "MIPS" ,
symbol : {
type : "mesh-3d" ,
symbolLayers : [
{
type : "fill" ,
material : { color : "#FD7F6F" , colorMixMode : "replace" }
}
]
},
label : "Office"
},
{
value : "RESIDENT" ,
symbol : {
type : "mesh-3d" ,
symbolLayers : [
{
type : "fill" ,
material : { color : "#7EB0D5" , colorMixMode : "replace" }
}
]
},
label : "Residential"
},
{
value : "MIXRES" ,
symbol : {
type : "mesh-3d" ,
symbolLayers : [
{
type : "fill" ,
material : { color : "#BD7EBE" , colorMixMode : "replace" }
}
]
},
label : "Mixed use"
},
{
value : "MIXED" ,
symbol : {
type : "mesh-3d" ,
symbolLayers : [
{
type : "fill" ,
material : { color : "#B2E061" , colorMixMode : "replace" }
}
]
},
label : "Mixed use without residential"
}
]
};
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